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<a name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a name="9" href="#9">9</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.fileupload;
<a name="18" href="#18">18</a>  
<a name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.io.ByteArrayOutputStream;
<a name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.io.InputStream;
<a name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.io.OutputStream;
<a name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.io.UnsupportedEncodingException;
<a name="24" href="#24">24</a>  
<a name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.fileupload.util.Closeable;
<a name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.fileupload.util.Streams;
<a name="27" href="#27">27</a>  
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * &lt;p&gt; Low level API for processing file uploads.</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> *</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * &lt;p&gt; This class can be used to process data streams conforming to MIME</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * 'multipart' format as defined in</em>
<a name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * &lt;a href="<a href="http://www.ietf.org/rfc/rfc1867.txt" target="alexandria_uri">http://www.ietf.org/rfc/rfc1867.txt</a>"&gt;RFC 1867&lt;/a&gt;. Arbitrarily</em>
<a name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * large amounts of data in the stream can be processed under constant</em>
<a name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * memory usage.</em>
<a name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> *</em>
<a name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;p&gt; The format of the stream is defined in the following way:&lt;br&gt;</em>
<a name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> *</em>
<a name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * &lt;code&gt;</em>
<a name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> *   multipart-body := preamble 1*encapsulation close-delimiter epilogue&lt;br&gt;</em>
<a name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> *   encapsulation := delimiter body CRLF&lt;br&gt;</em>
<a name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> *   delimiter := "--" boundary CRLF&lt;br&gt;</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> *   close-delimiter := "--" boudary "--"&lt;br&gt;</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> *   preamble := &amp;lt;ignore&amp;gt;&lt;br&gt;</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> *   epilogue := &amp;lt;ignore&amp;gt;&lt;br&gt;</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> *   body := header-part CRLF body-part&lt;br&gt;</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> *   header-part := 1*header CRLF&lt;br&gt;</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> *   header := header-name ":" header-value&lt;br&gt;</em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> *   header-name := &amp;lt;printable ascii characters except ":"&amp;gt;&lt;br&gt;</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> *   header-value := &amp;lt;any ascii characters except CR &amp; LF&amp;gt;&lt;br&gt;</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> *   body-data := &amp;lt;arbitrary data&amp;gt;&lt;br&gt;</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * &lt;/code&gt;</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> *</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;Note that body-data can contain another mulipart entity.  There</em>
<a name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * is limited support for single pass processing of such nested</em>
<a name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> * streams.  The nested stream is &lt;strong&gt;required&lt;/strong&gt; to have a</em>
<a name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * boundary token of the same length as the parent stream (see {@link</em>
<a name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * #setBoundary(byte[])}).</em>
<a name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> *</em>
<a name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;Here is an example of usage of this class.&lt;br&gt;</em>
<a name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> *</em>
<a name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> *   try {</em>
<a name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> *     MultipartStream multipartStream = new MultipartStream(input, boundary);</em>
<a name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> *     boolean nextPart = multipartStream.skipPreamble();</em>
<a name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> *     OutputStream output;</em>
<a name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> *     while(nextPart) {</em>
<a name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> *       String header = multipartStream.readHeaders();</em>
<a name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> *       // process headers</em>
<a name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> *       // create some output stream</em>
<a name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> *       multipartStream.readBodyData(output);</em>
<a name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> *       nextPart = multipartStream.readBoundary();</em>
<a name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> *     }</em>
<a name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> *   } catch(MultipartStream.MalformedStreamException e) {</em>
<a name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> *     // the stream failed to follow required syntax</em>
<a name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> *   } catch(IOException e) {</em>
<a name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> *     // a read or write error occurred</em>
<a name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> *   }</em>
<a name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> *</em>
<a name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:Rafal.Krzewski@e-point.pl" target="alexandria_uri">mailto:Rafal.Krzewski@e-point.pl</a>"&gt;Rafal Krzewski&lt;/a&gt;</em>
<a name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:martinc@apache.org" target="alexandria_uri">mailto:martinc@apache.org</a>"&gt;Martin Cooper&lt;/a&gt;</em>
<a name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * @author Sean C. Sullivan</em>
<a name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> *</em>
<a name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * @version $Id: MultipartStream.java 735374 2009-01-18 02:18:45Z jochen $</em>
<a name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> */</em>
<a name="87" href="#87">87</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a> {
<a name="88" href="#88">88</a>      <em class="jxr_javadoccomment">/**</em>
<a name="89" href="#89">89</a>  <em class="jxr_javadoccomment">     * Internal class, which is used to invoke the</em>
<a name="90" href="#90">90</a>  <em class="jxr_javadoccomment">     * {@link ProgressListener}.</em>
<a name="91" href="#91">91</a>  <em class="jxr_javadoccomment">     */</em>
<a name="92" href="#92">92</a>  	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> {
<a name="93" href="#93">93</a>          <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The listener to invoke.</em>
<a name="94" href="#94">94</a>  <em class="jxr_javadoccomment">         */</em>
<a name="95" href="#95">95</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/fileupload/ProgressListener.html">ProgressListener</a> listener;
<a name="96" href="#96">96</a>          <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Number of expected bytes, if known, or -1.</em>
<a name="97" href="#97">97</a>  <em class="jxr_javadoccomment">         */</em>
<a name="98" href="#98">98</a>          <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> contentLength;
<a name="99" href="#99">99</a>          <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Number of bytes, which have been read so far.</em>
<a name="100" href="#100">100</a> <em class="jxr_javadoccomment">         */</em>
<a name="101" href="#101">101</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> bytesRead;
<a name="102" href="#102">102</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Number of items, which have been read so far.</em>
<a name="103" href="#103">103</a> <em class="jxr_javadoccomment">         */</em>
<a name="104" href="#104">104</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> items;
<a name="105" href="#105">105</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Creates a new instance with the given listener</em>
<a name="106" href="#106">106</a> <em class="jxr_javadoccomment">         * and content length.</em>
<a name="107" href="#107">107</a> <em class="jxr_javadoccomment">         * @param pListener The listener to invoke.</em>
<a name="108" href="#108">108</a> <em class="jxr_javadoccomment">         * @param pContentLength The expected content length.</em>
<a name="109" href="#109">109</a> <em class="jxr_javadoccomment">         */</em>
<a name="110" href="#110">110</a>         <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a>(<a href="../../../../org/apache/commons/fileupload/ProgressListener.html">ProgressListener</a> pListener, <strong class="jxr_keyword">long</strong> pContentLength) {
<a name="111" href="#111">111</a>             listener = pListener;
<a name="112" href="#112">112</a>             contentLength = pContentLength;
<a name="113" href="#113">113</a>         }
<a name="114" href="#114">114</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Called to indicate that bytes have been read.</em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment">         * @param pBytes Number of bytes, which have been read.</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment">         */</em>
<a name="117" href="#117">117</a>         <strong class="jxr_keyword">void</strong> noteBytesRead(<strong class="jxr_keyword">int</strong> pBytes) {
<a name="118" href="#118">118</a>             <em class="jxr_comment">/*<em class="jxr_comment"> Indicates, that the given number of bytes have been read from</em></em>
<a name="119" href="#119">119</a> <em class="jxr_comment">             * the input stream.</em>
<a name="120" href="#120">120</a> <em class="jxr_comment">             */</em>
<a name="121" href="#121">121</a>             bytesRead += pBytes;
<a name="122" href="#122">122</a>             notifyListener();
<a name="123" href="#123">123</a>         }
<a name="124" href="#124">124</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Called to indicate, that a new file item has been detected.</em>
<a name="125" href="#125">125</a> <em class="jxr_javadoccomment">         */</em>
<a name="126" href="#126">126</a>         <strong class="jxr_keyword">void</strong> noteItem() {
<a name="127" href="#127">127</a>             ++items;
<a name="128" href="#128">128</a>             notifyListener();
<a name="129" href="#129">129</a>         }
<a name="130" href="#130">130</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Called for notifying the listener.</em>
<a name="131" href="#131">131</a> <em class="jxr_javadoccomment">         */</em>
<a name="132" href="#132">132</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> notifyListener() {
<a name="133" href="#133">133</a>             <strong class="jxr_keyword">if</strong> (listener != <strong class="jxr_keyword">null</strong>) {
<a name="134" href="#134">134</a>                 listener.update(bytesRead, contentLength, items);
<a name="135" href="#135">135</a>             }
<a name="136" href="#136">136</a>         }
<a name="137" href="#137">137</a>     }
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>     <em class="jxr_comment">// ----------------------------------------------------- Manifest constants</em>
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a> 
<a name="142" href="#142">142</a>     <em class="jxr_javadoccomment">/**</em>
<a name="143" href="#143">143</a> <em class="jxr_javadoccomment">     * The Carriage Return ASCII character value.</em>
<a name="144" href="#144">144</a> <em class="jxr_javadoccomment">     */</em>
<a name="145" href="#145">145</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte CR = 0x0D;
<a name="146" href="#146">146</a> 
<a name="147" href="#147">147</a> 
<a name="148" href="#148">148</a>     <em class="jxr_javadoccomment">/**</em>
<a name="149" href="#149">149</a> <em class="jxr_javadoccomment">     * The Line Feed ASCII character value.</em>
<a name="150" href="#150">150</a> <em class="jxr_javadoccomment">     */</em>
<a name="151" href="#151">151</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte LF = 0x0A;
<a name="152" href="#152">152</a> 
<a name="153" href="#153">153</a> 
<a name="154" href="#154">154</a>     <em class="jxr_javadoccomment">/**</em>
<a name="155" href="#155">155</a> <em class="jxr_javadoccomment">     * The dash (-) ASCII character value.</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment">     */</em>
<a name="157" href="#157">157</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte DASH = 0x2D;
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a> 
<a name="160" href="#160">160</a>     <em class="jxr_javadoccomment">/**</em>
<a name="161" href="#161">161</a> <em class="jxr_javadoccomment">     * The maximum length of &lt;code&gt;header-part&lt;/code&gt; that will be</em>
<a name="162" href="#162">162</a> <em class="jxr_javadoccomment">     * processed (10 kilobytes = 10240 bytes.).</em>
<a name="163" href="#163">163</a> <em class="jxr_javadoccomment">     */</em>
<a name="164" href="#164">164</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> HEADER_PART_SIZE_MAX = 10240;
<a name="165" href="#165">165</a> 
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>     <em class="jxr_javadoccomment">/**</em>
<a name="168" href="#168">168</a> <em class="jxr_javadoccomment">     * The default length of the buffer used for processing a request.</em>
<a name="169" href="#169">169</a> <em class="jxr_javadoccomment">     */</em>
<a name="170" href="#170">170</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_BUFSIZE = 4096;
<a name="171" href="#171">171</a> 
<a name="172" href="#172">172</a> 
<a name="173" href="#173">173</a>     <em class="jxr_javadoccomment">/**</em>
<a name="174" href="#174">174</a> <em class="jxr_javadoccomment">     * A byte sequence that marks the end of &lt;code&gt;header-part&lt;/code&gt;</em>
<a name="175" href="#175">175</a> <em class="jxr_javadoccomment">     * (&lt;code&gt;CRLFCRLF&lt;/code&gt;).</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment">     */</em>
<a name="177" href="#177">177</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] HEADER_SEPARATOR = {
<a name="178" href="#178">178</a>         CR, LF, CR, LF };
<a name="179" href="#179">179</a> 
<a name="180" href="#180">180</a> 
<a name="181" href="#181">181</a>     <em class="jxr_javadoccomment">/**</em>
<a name="182" href="#182">182</a> <em class="jxr_javadoccomment">     * A byte sequence that that follows a delimiter that will be</em>
<a name="183" href="#183">183</a> <em class="jxr_javadoccomment">     * followed by an encapsulation (&lt;code&gt;CRLF&lt;/code&gt;).</em>
<a name="184" href="#184">184</a> <em class="jxr_javadoccomment">     */</em>
<a name="185" href="#185">185</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] FIELD_SEPARATOR = {
<a name="186" href="#186">186</a>         CR, LF};
<a name="187" href="#187">187</a> 
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>     <em class="jxr_javadoccomment">/**</em>
<a name="190" href="#190">190</a> <em class="jxr_javadoccomment">     * A byte sequence that that follows a delimiter of the last</em>
<a name="191" href="#191">191</a> <em class="jxr_javadoccomment">     * encapsulation in the stream (&lt;code&gt;--&lt;/code&gt;).</em>
<a name="192" href="#192">192</a> <em class="jxr_javadoccomment">     */</em>
<a name="193" href="#193">193</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] STREAM_TERMINATOR = {
<a name="194" href="#194">194</a>         DASH, DASH};
<a name="195" href="#195">195</a> 
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>     <em class="jxr_javadoccomment">/**</em>
<a name="198" href="#198">198</a> <em class="jxr_javadoccomment">     * A byte sequence that precedes a boundary (&lt;code&gt;CRLF--&lt;/code&gt;).</em>
<a name="199" href="#199">199</a> <em class="jxr_javadoccomment">     */</em>
<a name="200" href="#200">200</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> byte[] BOUNDARY_PREFIX = {
<a name="201" href="#201">201</a>         CR, LF, DASH, DASH};
<a name="202" href="#202">202</a> 
<a name="203" href="#203">203</a> 
<a name="204" href="#204">204</a>     <em class="jxr_comment">// ----------------------------------------------------------- Data members</em>
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a> 
<a name="207" href="#207">207</a>     <em class="jxr_javadoccomment">/**</em>
<a name="208" href="#208">208</a> <em class="jxr_javadoccomment">     * The input stream from which data is read.</em>
<a name="209" href="#209">209</a> <em class="jxr_javadoccomment">     */</em>
<a name="210" href="#210">210</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> InputStream input;
<a name="211" href="#211">211</a> 
<a name="212" href="#212">212</a> 
<a name="213" href="#213">213</a>     <em class="jxr_javadoccomment">/**</em>
<a name="214" href="#214">214</a> <em class="jxr_javadoccomment">     * The length of the boundary token plus the leading &lt;code&gt;CRLF--&lt;/code&gt;.</em>
<a name="215" href="#215">215</a> <em class="jxr_javadoccomment">     */</em>
<a name="216" href="#216">216</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> boundaryLength;
<a name="217" href="#217">217</a> 
<a name="218" href="#218">218</a> 
<a name="219" href="#219">219</a>     <em class="jxr_javadoccomment">/**</em>
<a name="220" href="#220">220</a> <em class="jxr_javadoccomment">     * The amount of data, in bytes, that must be kept in the buffer in order</em>
<a name="221" href="#221">221</a> <em class="jxr_javadoccomment">     * to detect delimiters reliably.</em>
<a name="222" href="#222">222</a> <em class="jxr_javadoccomment">     */</em>
<a name="223" href="#223">223</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> keepRegion;
<a name="224" href="#224">224</a> 
<a name="225" href="#225">225</a> 
<a name="226" href="#226">226</a>     <em class="jxr_javadoccomment">/**</em>
<a name="227" href="#227">227</a> <em class="jxr_javadoccomment">     * The byte sequence that partitions the stream.</em>
<a name="228" href="#228">228</a> <em class="jxr_javadoccomment">     */</em>
<a name="229" href="#229">229</a>     <strong class="jxr_keyword">private</strong> byte[] boundary;
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a> 
<a name="232" href="#232">232</a>     <em class="jxr_javadoccomment">/**</em>
<a name="233" href="#233">233</a> <em class="jxr_javadoccomment">     * The length of the buffer used for processing the request.</em>
<a name="234" href="#234">234</a> <em class="jxr_javadoccomment">     */</em>
<a name="235" href="#235">235</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> bufSize;
<a name="236" href="#236">236</a> 
<a name="237" href="#237">237</a> 
<a name="238" href="#238">238</a>     <em class="jxr_javadoccomment">/**</em>
<a name="239" href="#239">239</a> <em class="jxr_javadoccomment">     * The buffer used for processing the request.</em>
<a name="240" href="#240">240</a> <em class="jxr_javadoccomment">     */</em>
<a name="241" href="#241">241</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> byte[] buffer;
<a name="242" href="#242">242</a> 
<a name="243" href="#243">243</a> 
<a name="244" href="#244">244</a>     <em class="jxr_javadoccomment">/**</em>
<a name="245" href="#245">245</a> <em class="jxr_javadoccomment">     * The index of first valid character in the buffer.</em>
<a name="246" href="#246">246</a> <em class="jxr_javadoccomment">     * &lt;br&gt;</em>
<a name="247" href="#247">247</a> <em class="jxr_javadoccomment">     * 0 &lt;= head &lt; bufSize</em>
<a name="248" href="#248">248</a> <em class="jxr_javadoccomment">     */</em>
<a name="249" href="#249">249</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> head;
<a name="250" href="#250">250</a> 
<a name="251" href="#251">251</a> 
<a name="252" href="#252">252</a>     <em class="jxr_javadoccomment">/**</em>
<a name="253" href="#253">253</a> <em class="jxr_javadoccomment">     * The index of last valid characer in the buffer + 1.</em>
<a name="254" href="#254">254</a> <em class="jxr_javadoccomment">     * &lt;br&gt;</em>
<a name="255" href="#255">255</a> <em class="jxr_javadoccomment">     * 0 &lt;= tail &lt;= bufSize</em>
<a name="256" href="#256">256</a> <em class="jxr_javadoccomment">     */</em>
<a name="257" href="#257">257</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> tail;
<a name="258" href="#258">258</a> 
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>     <em class="jxr_javadoccomment">/**</em>
<a name="261" href="#261">261</a> <em class="jxr_javadoccomment">     * The content encoding to use when reading headers.</em>
<a name="262" href="#262">262</a> <em class="jxr_javadoccomment">     */</em>
<a name="263" href="#263">263</a>     <strong class="jxr_keyword">private</strong> String headerEncoding;
<a name="264" href="#264">264</a> 
<a name="265" href="#265">265</a> 
<a name="266" href="#266">266</a>     <em class="jxr_javadoccomment">/**</em>
<a name="267" href="#267">267</a> <em class="jxr_javadoccomment">     * The progress notifier, if any, or null.</em>
<a name="268" href="#268">268</a> <em class="jxr_javadoccomment">     */</em>
<a name="269" href="#269">269</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> notifier;
<a name="270" href="#270">270</a> 
<a name="271" href="#271">271</a>     <em class="jxr_comment">// ----------------------------------------------------------- Constructors</em>
<a name="272" href="#272">272</a> 
<a name="273" href="#273">273</a>     <em class="jxr_javadoccomment">/**</em>
<a name="274" href="#274">274</a> <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a name="275" href="#275">275</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[],</em>
<a name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * org.apache.commons.fileupload.MultipartStream.ProgressNotifier)},</em>
<a name="277" href="#277">277</a> <em class="jxr_javadoccomment">     * or {@link #MultipartStream(InputStream, byte[], int,</em>
<a name="278" href="#278">278</a> <em class="jxr_javadoccomment">     * org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}</em>
<a name="279" href="#279">279</a> <em class="jxr_javadoccomment">     */</em>
<a name="280" href="#280">280</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>() {
<a name="281" href="#281">281</a>         <strong class="jxr_keyword">this</strong>(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>);
<a name="282" href="#282">282</a>     }
<a name="283" href="#283">283</a> 
<a name="284" href="#284">284</a>     <em class="jxr_javadoccomment">/**</em>
<a name="285" href="#285">285</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a custom size buffer</em>
<a name="286" href="#286">286</a> <em class="jxr_javadoccomment">     * and no progress notifier.</em>
<a name="287" href="#287">287</a> <em class="jxr_javadoccomment">     *</em>
<a name="288" href="#288">288</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Note that the buffer must be at least big enough to contain the</em>
<a name="289" href="#289">289</a> <em class="jxr_javadoccomment">     * boundary string, plus 4 characters for CR/LF and double dash, plus at</em>
<a name="290" href="#290">290</a> <em class="jxr_javadoccomment">     * least one byte of data.  Too small a buffer size setting will degrade</em>
<a name="291" href="#291">291</a> <em class="jxr_javadoccomment">     * performance.</em>
<a name="292" href="#292">292</a> <em class="jxr_javadoccomment">     *</em>
<a name="293" href="#293">293</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="294" href="#294">294</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="295" href="#295">295</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="296" href="#296">296</a> <em class="jxr_javadoccomment">     * @param bufSize  The size of the buffer to be used, in bytes.</em>
<a name="297" href="#297">297</a> <em class="jxr_javadoccomment">     *</em>
<a name="298" href="#298">298</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[],</em>
<a name="299" href="#299">299</a> <em class="jxr_javadoccomment">     *   MultipartStream.ProgressNotifier)</em>
<a name="300" href="#300">300</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[], int,</em>
<a name="301" href="#301">301</a> <em class="jxr_javadoccomment">     *  org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}.</em>
<a name="302" href="#302">302</a> <em class="jxr_javadoccomment">     */</em>
<a name="303" href="#303">303</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input, byte[] boundary, <strong class="jxr_keyword">int</strong> bufSize) {
<a name="304" href="#304">304</a>         <strong class="jxr_keyword">this</strong>(input, boundary, bufSize, <strong class="jxr_keyword">null</strong>);
<a name="305" href="#305">305</a>     }
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a>     <em class="jxr_javadoccomment">/**</em>
<a name="308" href="#308">308</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a custom size buffer.</em>
<a name="309" href="#309">309</a> <em class="jxr_javadoccomment">     *</em>
<a name="310" href="#310">310</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Note that the buffer must be at least big enough to contain the</em>
<a name="311" href="#311">311</a> <em class="jxr_javadoccomment">     * boundary string, plus 4 characters for CR/LF and double dash, plus at</em>
<a name="312" href="#312">312</a> <em class="jxr_javadoccomment">     * least one byte of data.  Too small a buffer size setting will degrade</em>
<a name="313" href="#313">313</a> <em class="jxr_javadoccomment">     * performance.</em>
<a name="314" href="#314">314</a> <em class="jxr_javadoccomment">     *</em>
<a name="315" href="#315">315</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="316" href="#316">316</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="317" href="#317">317</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="318" href="#318">318</a> <em class="jxr_javadoccomment">     * @param bufSize  The size of the buffer to be used, in bytes.</em>
<a name="319" href="#319">319</a> <em class="jxr_javadoccomment">     * @param pNotifier The notifier, which is used for calling the</em>
<a name="320" href="#320">320</a> <em class="jxr_javadoccomment">     *                  progress listener, if any.</em>
<a name="321" href="#321">321</a> <em class="jxr_javadoccomment">     *</em>
<a name="322" href="#322">322</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[],</em>
<a name="323" href="#323">323</a> <em class="jxr_javadoccomment">     *     MultipartStream.ProgressNotifier)</em>
<a name="324" href="#324">324</a> <em class="jxr_javadoccomment">     */</em>
<a name="325" href="#325">325</a>     <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="326" href="#326">326</a>             byte[] boundary,
<a name="327" href="#327">327</a>             <strong class="jxr_keyword">int</strong> bufSize,
<a name="328" href="#328">328</a>             <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> pNotifier) {
<a name="329" href="#329">329</a>         <strong class="jxr_keyword">this</strong>.input = input;
<a name="330" href="#330">330</a>         <strong class="jxr_keyword">this</strong>.bufSize = bufSize;
<a name="331" href="#331">331</a>         <strong class="jxr_keyword">this</strong>.buffer = <strong class="jxr_keyword">new</strong> byte[bufSize];
<a name="332" href="#332">332</a>         <strong class="jxr_keyword">this</strong>.notifier = pNotifier;
<a name="333" href="#333">333</a> 
<a name="334" href="#334">334</a>         <em class="jxr_comment">// We prepend CR/LF to the boundary to chop trailng CR/LF from</em>
<a name="335" href="#335">335</a>         <em class="jxr_comment">// body-data tokens.</em>
<a name="336" href="#336">336</a>         <strong class="jxr_keyword">this</strong>.boundary = <strong class="jxr_keyword">new</strong> byte[boundary.length + BOUNDARY_PREFIX.length];
<a name="337" href="#337">337</a>         <strong class="jxr_keyword">this</strong>.boundaryLength = boundary.length + BOUNDARY_PREFIX.length;
<a name="338" href="#338">338</a>         <strong class="jxr_keyword">this</strong>.keepRegion = <strong class="jxr_keyword">this</strong>.boundary.length;
<a name="339" href="#339">339</a>         System.arraycopy(BOUNDARY_PREFIX, 0, <strong class="jxr_keyword">this</strong>.boundary, 0,
<a name="340" href="#340">340</a>                 BOUNDARY_PREFIX.length);
<a name="341" href="#341">341</a>         System.arraycopy(boundary, 0, <strong class="jxr_keyword">this</strong>.boundary, BOUNDARY_PREFIX.length,
<a name="342" href="#342">342</a>                 boundary.length);
<a name="343" href="#343">343</a> 
<a name="344" href="#344">344</a>         head = 0;
<a name="345" href="#345">345</a>         tail = 0;
<a name="346" href="#346">346</a>     }
<a name="347" href="#347">347</a> 
<a name="348" href="#348">348</a> 
<a name="349" href="#349">349</a>     <em class="jxr_javadoccomment">/**</em>
<a name="350" href="#350">350</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a default size buffer.</em>
<a name="351" href="#351">351</a> <em class="jxr_javadoccomment">     *</em>
<a name="352" href="#352">352</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="353" href="#353">353</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="354" href="#354">354</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="355" href="#355">355</a> <em class="jxr_javadoccomment">     * @param pNotifier An object for calling the progress listener, if any.</em>
<a name="356" href="#356">356</a> <em class="jxr_javadoccomment">     *</em>
<a name="357" href="#357">357</a> <em class="jxr_javadoccomment">     *</em>
<a name="358" href="#358">358</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[], int,</em>
<a name="359" href="#359">359</a> <em class="jxr_javadoccomment">     *     MultipartStream.ProgressNotifier)</em>
<a name="360" href="#360">360</a> <em class="jxr_javadoccomment">     */</em>
<a name="361" href="#361">361</a>     <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="362" href="#362">362</a>             byte[] boundary,
<a name="363" href="#363">363</a>             <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> pNotifier) {
<a name="364" href="#364">364</a>         <strong class="jxr_keyword">this</strong>(input, boundary, DEFAULT_BUFSIZE, pNotifier);
<a name="365" href="#365">365</a>     }
<a name="366" href="#366">366</a> 
<a name="367" href="#367">367</a>     <em class="jxr_javadoccomment">/**</em>
<a name="368" href="#368">368</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a default size buffer.</em>
<a name="369" href="#369">369</a> <em class="jxr_javadoccomment">     *</em>
<a name="370" href="#370">370</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="371" href="#371">371</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="372" href="#372">372</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="373" href="#373">373</a> <em class="jxr_javadoccomment">     *</em>
<a name="374" href="#374">374</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[],</em>
<a name="375" href="#375">375</a> <em class="jxr_javadoccomment">     *  MultipartStream.ProgressNotifier)}.</em>
<a name="376" href="#376">376</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[], int,</em>
<a name="377" href="#377">377</a> <em class="jxr_javadoccomment">     *  MultipartStream.ProgressNotifier)</em>
<a name="378" href="#378">378</a> <em class="jxr_javadoccomment">     */</em>
<a name="379" href="#379">379</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="380" href="#380">380</a>             byte[] boundary) {
<a name="381" href="#381">381</a>         <strong class="jxr_keyword">this</strong>(input, boundary, DEFAULT_BUFSIZE, <strong class="jxr_keyword">null</strong>);
<a name="382" href="#382">382</a>     }
<a name="383" href="#383">383</a> 
<a name="384" href="#384">384</a>     <em class="jxr_comment">// --------------------------------------------------------- Public methods</em>
<a name="385" href="#385">385</a> 
<a name="386" href="#386">386</a> 
<a name="387" href="#387">387</a>     <em class="jxr_javadoccomment">/**</em>
<a name="388" href="#388">388</a> <em class="jxr_javadoccomment">     * Retrieves the character encoding used when reading the headers of an</em>
<a name="389" href="#389">389</a> <em class="jxr_javadoccomment">     * individual part. When not specified, or &lt;code&gt;null&lt;/code&gt;, the platform</em>
<a name="390" href="#390">390</a> <em class="jxr_javadoccomment">     * default encoding is used.</em>
<a name="391" href="#391">391</a> 
<a name="392" href="#392">392</a> <em class="jxr_javadoccomment">     *</em>
<a name="393" href="#393">393</a> <em class="jxr_javadoccomment">     * @return The encoding used to read part headers.</em>
<a name="394" href="#394">394</a> <em class="jxr_javadoccomment">     */</em>
<a name="395" href="#395">395</a>     <strong class="jxr_keyword">public</strong> String getHeaderEncoding() {
<a name="396" href="#396">396</a>         <strong class="jxr_keyword">return</strong> headerEncoding;
<a name="397" href="#397">397</a>     }
<a name="398" href="#398">398</a> 
<a name="399" href="#399">399</a> 
<a name="400" href="#400">400</a>     <em class="jxr_javadoccomment">/**</em>
<a name="401" href="#401">401</a> <em class="jxr_javadoccomment">     * Specifies the character encoding to be used when reading the headers of</em>
<a name="402" href="#402">402</a> <em class="jxr_javadoccomment">     * individual parts. When not specified, or &lt;code&gt;null&lt;/code&gt;, the platform</em>
<a name="403" href="#403">403</a> <em class="jxr_javadoccomment">     * default encoding is used.</em>
<a name="404" href="#404">404</a> <em class="jxr_javadoccomment">     *</em>
<a name="405" href="#405">405</a> <em class="jxr_javadoccomment">     * @param encoding The encoding used to read part headers.</em>
<a name="406" href="#406">406</a> <em class="jxr_javadoccomment">     */</em>
<a name="407" href="#407">407</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setHeaderEncoding(String encoding) {
<a name="408" href="#408">408</a>         headerEncoding = encoding;
<a name="409" href="#409">409</a>     }
<a name="410" href="#410">410</a> 
<a name="411" href="#411">411</a> 
<a name="412" href="#412">412</a>     <em class="jxr_javadoccomment">/**</em>
<a name="413" href="#413">413</a> <em class="jxr_javadoccomment">     * Reads a byte from the &lt;code&gt;buffer&lt;/code&gt;, and refills it as</em>
<a name="414" href="#414">414</a> <em class="jxr_javadoccomment">     * necessary.</em>
<a name="415" href="#415">415</a> <em class="jxr_javadoccomment">     *</em>
<a name="416" href="#416">416</a> <em class="jxr_javadoccomment">     * @return The next byte from the input stream.</em>
<a name="417" href="#417">417</a> <em class="jxr_javadoccomment">     *</em>
<a name="418" href="#418">418</a> <em class="jxr_javadoccomment">     * @throws IOException if there is no more data available.</em>
<a name="419" href="#419">419</a> <em class="jxr_javadoccomment">     */</em>
<a name="420" href="#420">420</a>     <strong class="jxr_keyword">public</strong> byte readByte() <strong class="jxr_keyword">throws</strong> IOException {
<a name="421" href="#421">421</a>         <em class="jxr_comment">// Buffer depleted ?</em>
<a name="422" href="#422">422</a>         <strong class="jxr_keyword">if</strong> (head == tail) {
<a name="423" href="#423">423</a>             head = 0;
<a name="424" href="#424">424</a>             <em class="jxr_comment">// Refill.</em>
<a name="425" href="#425">425</a>             tail = input.read(buffer, head, bufSize);
<a name="426" href="#426">426</a>             <strong class="jxr_keyword">if</strong> (tail == -1) {
<a name="427" href="#427">427</a>                 <em class="jxr_comment">// No more data available.</em>
<a name="428" href="#428">428</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IOException(<span class="jxr_string">"No more data is available"</span>);
<a name="429" href="#429">429</a>             }
<a name="430" href="#430">430</a>             <strong class="jxr_keyword">if</strong> (notifier != <strong class="jxr_keyword">null</strong>) {
<a name="431" href="#431">431</a>                 notifier.noteBytesRead(tail);
<a name="432" href="#432">432</a>             }
<a name="433" href="#433">433</a>         }
<a name="434" href="#434">434</a>         <strong class="jxr_keyword">return</strong> buffer[head++];
<a name="435" href="#435">435</a>     }
<a name="436" href="#436">436</a> 
<a name="437" href="#437">437</a> 
<a name="438" href="#438">438</a>     <em class="jxr_javadoccomment">/**</em>
<a name="439" href="#439">439</a> <em class="jxr_javadoccomment">     * Skips a &lt;code&gt;boundary&lt;/code&gt; token, and checks whether more</em>
<a name="440" href="#440">440</a> <em class="jxr_javadoccomment">     * &lt;code&gt;encapsulations&lt;/code&gt; are contained in the stream.</em>
<a name="441" href="#441">441</a> <em class="jxr_javadoccomment">     *</em>
<a name="442" href="#442">442</a> <em class="jxr_javadoccomment">     * @return &lt;code&gt;true&lt;/code&gt; if there are more encapsulations in</em>
<a name="443" href="#443">443</a> <em class="jxr_javadoccomment">     *         this stream; &lt;code&gt;false&lt;/code&gt; otherwise.</em>
<a name="444" href="#444">444</a> <em class="jxr_javadoccomment">     *</em>
<a name="445" href="#445">445</a> <em class="jxr_javadoccomment">     * @throws MalformedStreamException if the stream ends unexpecetedly or</em>
<a name="446" href="#446">446</a> <em class="jxr_javadoccomment">     *                                  fails to follow required syntax.</em>
<a name="447" href="#447">447</a> <em class="jxr_javadoccomment">     */</em>
<a name="448" href="#448">448</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> readBoundary()
<a name="449" href="#449">449</a>             <strong class="jxr_keyword">throws</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a> {
<a name="450" href="#450">450</a>         byte[] marker = <strong class="jxr_keyword">new</strong> byte[2];
<a name="451" href="#451">451</a>         <strong class="jxr_keyword">boolean</strong> nextChunk = false;
<a name="452" href="#452">452</a> 
<a name="453" href="#453">453</a>         head += boundaryLength;
<a name="454" href="#454">454</a>         <strong class="jxr_keyword">try</strong> {
<a name="455" href="#455">455</a>             marker[0] = readByte();
<a name="456" href="#456">456</a>             <strong class="jxr_keyword">if</strong> (marker[0] == LF) {
<a name="457" href="#457">457</a>                 <em class="jxr_comment">// Work around IE5 Mac bug with input type=image.</em>
<a name="458" href="#458">458</a>                 <em class="jxr_comment">// Because the boundary delimiter, not including the trailing</em>
<a name="459" href="#459">459</a>                 <em class="jxr_comment">// CRLF, must not appear within any file (RFC 2046, section</em>
<a name="460" href="#460">460</a>                 <em class="jxr_comment">// 5.1.1), we know the missing CR is due to a buggy browser</em>
<a name="461" href="#461">461</a>                 <em class="jxr_comment">// rather than a file containing something similar to a</em>
<a name="462" href="#462">462</a>                 <em class="jxr_comment">// boundary.</em>
<a name="463" href="#463">463</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="464" href="#464">464</a>             }
<a name="465" href="#465">465</a> 
<a name="466" href="#466">466</a>             marker[1] = readByte();
<a name="467" href="#467">467</a>             <strong class="jxr_keyword">if</strong> (arrayequals(marker, STREAM_TERMINATOR, 2)) {
<a name="468" href="#468">468</a>                 nextChunk = false;
<a name="469" href="#469">469</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (arrayequals(marker, FIELD_SEPARATOR, 2)) {
<a name="470" href="#470">470</a>                 nextChunk = <strong class="jxr_keyword">true</strong>;
<a name="471" href="#471">471</a>             } <strong class="jxr_keyword">else</strong> {
<a name="472" href="#472">472</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(
<a name="473" href="#473">473</a>                 <span class="jxr_string">"Unexpected characters follow a boundary"</span>);
<a name="474" href="#474">474</a>             }
<a name="475" href="#475">475</a>         } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="476" href="#476">476</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(<span class="jxr_string">"Stream ended unexpectedly"</span>);
<a name="477" href="#477">477</a>         }
<a name="478" href="#478">478</a>         <strong class="jxr_keyword">return</strong> nextChunk;
<a name="479" href="#479">479</a>     }
<a name="480" href="#480">480</a> 
<a name="481" href="#481">481</a> 
<a name="482" href="#482">482</a>     <em class="jxr_javadoccomment">/**</em>
<a name="483" href="#483">483</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Changes the boundary token used for partitioning the stream.</em>
<a name="484" href="#484">484</a> <em class="jxr_javadoccomment">     *</em>
<a name="485" href="#485">485</a> <em class="jxr_javadoccomment">     * &lt;p&gt;This method allows single pass processing of nested multipart</em>
<a name="486" href="#486">486</a> <em class="jxr_javadoccomment">     * streams.</em>
<a name="487" href="#487">487</a> <em class="jxr_javadoccomment">     *</em>
<a name="488" href="#488">488</a> <em class="jxr_javadoccomment">     * &lt;p&gt;The boundary token of the nested stream is &lt;code&gt;required&lt;/code&gt;</em>
<a name="489" href="#489">489</a> <em class="jxr_javadoccomment">     * to be of the same length as the boundary token in parent stream.</em>
<a name="490" href="#490">490</a> <em class="jxr_javadoccomment">     *</em>
<a name="491" href="#491">491</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Restoring the parent stream boundary token after processing of a</em>
<a name="492" href="#492">492</a> <em class="jxr_javadoccomment">     * nested stream is left to the application.</em>
<a name="493" href="#493">493</a> <em class="jxr_javadoccomment">     *</em>
<a name="494" href="#494">494</a> <em class="jxr_javadoccomment">     * @param boundary The boundary to be used for parsing of the nested</em>
<a name="495" href="#495">495</a> <em class="jxr_javadoccomment">     *                 stream.</em>
<a name="496" href="#496">496</a> <em class="jxr_javadoccomment">     *</em>
<a name="497" href="#497">497</a> <em class="jxr_javadoccomment">     * @throws IllegalBoundaryException if the &lt;code&gt;boundary&lt;/code&gt;</em>
<a name="498" href="#498">498</a> <em class="jxr_javadoccomment">     *                                  has a different length than the one</em>
<a name="499" href="#499">499</a> <em class="jxr_javadoccomment">     *                                  being currently parsed.</em>
<a name="500" href="#500">500</a> <em class="jxr_javadoccomment">     */</em>
<a name="501" href="#501">501</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setBoundary(byte[] boundary)
<a name="502" href="#502">502</a>             <strong class="jxr_keyword">throws</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">IllegalBoundaryException</a> {
<a name="503" href="#503">503</a>         <strong class="jxr_keyword">if</strong> (boundary.length != boundaryLength - BOUNDARY_PREFIX.length) {
<a name="504" href="#504">504</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">IllegalBoundaryException</a>(
<a name="505" href="#505">505</a>             <span class="jxr_string">"The length of a boundary token can not be changed"</span>);
<a name="506" href="#506">506</a>         }
<a name="507" href="#507">507</a>         System.arraycopy(boundary, 0, <strong class="jxr_keyword">this</strong>.boundary, BOUNDARY_PREFIX.length,
<a name="508" href="#508">508</a>                 boundary.length);
<a name="509" href="#509">509</a>     }
<a name="510" href="#510">510</a> 
<a name="511" href="#511">511</a> 
<a name="512" href="#512">512</a>     <em class="jxr_javadoccomment">/**</em>
<a name="513" href="#513">513</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Reads the &lt;code&gt;header-part&lt;/code&gt; of the current</em>
<a name="514" href="#514">514</a> <em class="jxr_javadoccomment">     * &lt;code&gt;encapsulation&lt;/code&gt;.</em>
<a name="515" href="#515">515</a> <em class="jxr_javadoccomment">     *</em>
<a name="516" href="#516">516</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Headers are returned verbatim to the input stream, including the</em>
<a name="517" href="#517">517</a> <em class="jxr_javadoccomment">     * trailing &lt;code&gt;CRLF&lt;/code&gt; marker. Parsing is left to the</em>
<a name="518" href="#518">518</a> <em class="jxr_javadoccomment">     * application.</em>
<a name="519" href="#519">519</a> <em class="jxr_javadoccomment">     *</em>
<a name="520" href="#520">520</a> <em class="jxr_javadoccomment">     * &lt;p&gt;&lt;strong&gt;TODO&lt;/strong&gt; allow limiting maximum header size to</em>
<a name="521" href="#521">521</a> <em class="jxr_javadoccomment">     * protect against abuse.</em>
<a name="522" href="#522">522</a> <em class="jxr_javadoccomment">     *</em>
<a name="523" href="#523">523</a> <em class="jxr_javadoccomment">     * @return The &lt;code&gt;header-part&lt;/code&gt; of the current encapsulation.</em>
<a name="524" href="#524">524</a> <em class="jxr_javadoccomment">     *</em>
<a name="525" href="#525">525</a> <em class="jxr_javadoccomment">     * @throws MalformedStreamException if the stream ends unexpecetedly.</em>
<a name="526" href="#526">526</a> <em class="jxr_javadoccomment">     */</em>
<a name="527" href="#527">527</a>     <strong class="jxr_keyword">public</strong> String readHeaders()
<a name="528" href="#528">528</a>     <strong class="jxr_keyword">throws</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a> {
<a name="529" href="#529">529</a>         <strong class="jxr_keyword">int</strong> i = 0;
<a name="530" href="#530">530</a>         byte b;
<a name="531" href="#531">531</a>         <em class="jxr_comment">// to support multi-byte characters</em>
<a name="532" href="#532">532</a>         ByteArrayOutputStream baos = <strong class="jxr_keyword">new</strong> ByteArrayOutputStream();
<a name="533" href="#533">533</a>         <strong class="jxr_keyword">int</strong> size = 0;
<a name="534" href="#534">534</a>         <strong class="jxr_keyword">while</strong> (i &lt; HEADER_SEPARATOR.length) {
<a name="535" href="#535">535</a>             <strong class="jxr_keyword">try</strong> {
<a name="536" href="#536">536</a>                 b = readByte();
<a name="537" href="#537">537</a>             } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="538" href="#538">538</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(<span class="jxr_string">"Stream ended unexpectedly"</span>);
<a name="539" href="#539">539</a>             }
<a name="540" href="#540">540</a>             <strong class="jxr_keyword">if</strong> (++size &gt; HEADER_PART_SIZE_MAX) {
<a name="541" href="#541">541</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(
<a name="542" href="#542">542</a>                         <span class="jxr_string">"Header section has more than "</span> + HEADER_PART_SIZE_MAX
<a name="543" href="#543">543</a>                         + <span class="jxr_string">" bytes (maybe it is not properly terminated)"</span>);
<a name="544" href="#544">544</a>             }
<a name="545" href="#545">545</a>             <strong class="jxr_keyword">if</strong> (b == HEADER_SEPARATOR[i]) {
<a name="546" href="#546">546</a>                 i++;
<a name="547" href="#547">547</a>             } <strong class="jxr_keyword">else</strong> {
<a name="548" href="#548">548</a>                 i = 0;
<a name="549" href="#549">549</a>             }
<a name="550" href="#550">550</a>             baos.write(b);
<a name="551" href="#551">551</a>         }
<a name="552" href="#552">552</a> 
<a name="553" href="#553">553</a>         String headers = <strong class="jxr_keyword">null</strong>;
<a name="554" href="#554">554</a>         <strong class="jxr_keyword">if</strong> (headerEncoding != <strong class="jxr_keyword">null</strong>) {
<a name="555" href="#555">555</a>             <strong class="jxr_keyword">try</strong> {
<a name="556" href="#556">556</a>                 headers = baos.toString(headerEncoding);
<a name="557" href="#557">557</a>             } <strong class="jxr_keyword">catch</strong> (UnsupportedEncodingException e) {
<a name="558" href="#558">558</a>                 <em class="jxr_comment">// Fall back to platform default if specified encoding is not</em>
<a name="559" href="#559">559</a>                 <em class="jxr_comment">// supported.</em>
<a name="560" href="#560">560</a>                 headers = baos.toString();
<a name="561" href="#561">561</a>             }
<a name="562" href="#562">562</a>         } <strong class="jxr_keyword">else</strong> {
<a name="563" href="#563">563</a>             headers = baos.toString();
<a name="564" href="#564">564</a>         }
<a name="565" href="#565">565</a> 
<a name="566" href="#566">566</a>         <strong class="jxr_keyword">return</strong> headers;
<a name="567" href="#567">567</a>     }
<a name="568" href="#568">568</a> 
<a name="569" href="#569">569</a> 
<a name="570" href="#570">570</a>     <em class="jxr_javadoccomment">/**</em>
<a name="571" href="#571">571</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Reads &lt;code&gt;body-data&lt;/code&gt; from the current</em>
<a name="572" href="#572">572</a> <em class="jxr_javadoccomment">     * &lt;code&gt;encapsulation&lt;/code&gt; and writes its contents into the</em>
<a name="573" href="#573">573</a> <em class="jxr_javadoccomment">     * output &lt;code&gt;Stream&lt;/code&gt;.</em>
<a name="574" href="#574">574</a> <em class="jxr_javadoccomment">     *</em>
<a name="575" href="#575">575</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Arbitrary large amounts of data can be processed by this</em>
<a name="576" href="#576">576</a> <em class="jxr_javadoccomment">     * method using a constant size buffer. (see {@link</em>
<a name="577" href="#577">577</a> <em class="jxr_javadoccomment">     * #MultipartStream(InputStream,byte[],int,</em>
<a name="578" href="#578">578</a> <em class="jxr_javadoccomment">     *   MultipartStream.ProgressNotifier) constructor}).</em>
<a name="579" href="#579">579</a> <em class="jxr_javadoccomment">     *</em>
<a name="580" href="#580">580</a> <em class="jxr_javadoccomment">     * @param output The &lt;code&gt;Stream&lt;/code&gt; to write data into. May</em>
<a name="581" href="#581">581</a> <em class="jxr_javadoccomment">     *               be null, in which case this method is equivalent</em>
<a name="582" href="#582">582</a> <em class="jxr_javadoccomment">     *               to {@link #discardBodyData()}.</em>
<a name="583" href="#583">583</a> <em class="jxr_javadoccomment">     *</em>
<a name="584" href="#584">584</a> <em class="jxr_javadoccomment">     * @return the amount of data written.</em>
<a name="585" href="#585">585</a> <em class="jxr_javadoccomment">     *</em>
<a name="586" href="#586">586</a> <em class="jxr_javadoccomment">     * @throws MalformedStreamException if the stream ends unexpectedly.</em>
<a name="587" href="#587">587</a> <em class="jxr_javadoccomment">     * @throws IOException              if an i/o error occurs.</em>
<a name="588" href="#588">588</a> <em class="jxr_javadoccomment">     */</em>
<a name="589" href="#589">589</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> readBodyData(OutputStream output)
<a name="590" href="#590">590</a>             <strong class="jxr_keyword">throws</strong> MalformedStreamException, IOException {
<a name="591" href="#591">591</a>         <strong class="jxr_keyword">final</strong> InputStream istream = newInputStream();
<a name="592" href="#592">592</a>         <strong class="jxr_keyword">return</strong> (<strong class="jxr_keyword">int</strong>) Streams.copy(istream, output, false);
<a name="593" href="#593">593</a>     }
<a name="594" href="#594">594</a> 
<a name="595" href="#595">595</a>     <em class="jxr_javadoccomment">/**</em>
<a name="596" href="#596">596</a> <em class="jxr_javadoccomment">     * Creates a new {@link ItemInputStream}.</em>
<a name="597" href="#597">597</a> <em class="jxr_javadoccomment">     * @return A new instance of {@link ItemInputStream}.</em>
<a name="598" href="#598">598</a> <em class="jxr_javadoccomment">     */</em>
<a name="599" href="#599">599</a>     <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ItemInputStream</a> newInputStream() {
<a name="600" href="#600">600</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ItemInputStream</a>();
<a name="601" href="#601">601</a>     }
<a name="602" href="#602">602</a> 
<a name="603" href="#603">603</a>     <em class="jxr_javadoccomment">/**</em>
<a name="604" href="#604">604</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Reads &lt;code&gt;body-data&lt;/code&gt; from the current</em>
<a name="605" href="#605">605</a> <em class="jxr_javadoccomment">     * &lt;code&gt;encapsulation&lt;/code&gt; and discards it.</em>
<a name="606" href="#606">606</a> <em class="jxr_javadoccomment">     *</em>
<a name="607" href="#607">607</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Use this method to skip encapsulations you don't need or don't</em>
<a name="608" href="#608">608</a> <em class="jxr_javadoccomment">     * understand.</em>
<a name="609" href="#609">609</a> <em class="jxr_javadoccomment">     *</em>
<a name="610" href="#610">610</a> <em class="jxr_javadoccomment">     * @return The amount of data discarded.</em>
<a name="611" href="#611">611</a> <em class="jxr_javadoccomment">     *</em>
<a name="612" href="#612">612</a> <em class="jxr_javadoccomment">     * @throws MalformedStreamException if the stream ends unexpectedly.</em>
<a name="613" href="#613">613</a> <em class="jxr_javadoccomment">     * @throws IOException              if an i/o error occurs.</em>
<a name="614" href="#614">614</a> <em class="jxr_javadoccomment">     */</em>
<a name="615" href="#615">615</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> discardBodyData()
<a name="616" href="#616">616</a>     <strong class="jxr_keyword">throws</strong> MalformedStreamException,
<a name="617" href="#617">617</a>     IOException {
<a name="618" href="#618">618</a>         <strong class="jxr_keyword">return</strong> readBodyData(<strong class="jxr_keyword">null</strong>);
<a name="619" href="#619">619</a>     }
<a name="620" href="#620">620</a> 
<a name="621" href="#621">621</a> 
<a name="622" href="#622">622</a>     <em class="jxr_javadoccomment">/**</em>
<a name="623" href="#623">623</a> <em class="jxr_javadoccomment">     * Finds the beginning of the first &lt;code&gt;encapsulation&lt;/code&gt;.</em>
<a name="624" href="#624">624</a> <em class="jxr_javadoccomment">     *</em>
<a name="625" href="#625">625</a> <em class="jxr_javadoccomment">     * @return &lt;code&gt;true&lt;/code&gt; if an &lt;code&gt;encapsulation&lt;/code&gt; was found in</em>
<a name="626" href="#626">626</a> <em class="jxr_javadoccomment">     *         the stream.</em>
<a name="627" href="#627">627</a> <em class="jxr_javadoccomment">     *</em>
<a name="628" href="#628">628</a> <em class="jxr_javadoccomment">     * @throws IOException if an i/o error occurs.</em>
<a name="629" href="#629">629</a> <em class="jxr_javadoccomment">     */</em>
<a name="630" href="#630">630</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> skipPreamble()
<a name="631" href="#631">631</a>     <strong class="jxr_keyword">throws</strong> IOException {
<a name="632" href="#632">632</a>         <em class="jxr_comment">// First delimiter may be not preceeded with a CRLF.</em>
<a name="633" href="#633">633</a>         System.arraycopy(boundary, 2, boundary, 0, boundary.length - 2);
<a name="634" href="#634">634</a>         boundaryLength = boundary.length - 2;
<a name="635" href="#635">635</a>         <strong class="jxr_keyword">try</strong> {
<a name="636" href="#636">636</a>             <em class="jxr_comment">// Discard all data up to the delimiter.</em>
<a name="637" href="#637">637</a>             discardBodyData();
<a name="638" href="#638">638</a> 
<a name="639" href="#639">639</a>             <em class="jxr_comment">// Read boundary - if succeded, the stream contains an</em>
<a name="640" href="#640">640</a>             <em class="jxr_comment">// encapsulation.</em>
<a name="641" href="#641">641</a>             <strong class="jxr_keyword">return</strong> readBoundary();
<a name="642" href="#642">642</a>         } <strong class="jxr_keyword">catch</strong> (MalformedStreamException e) {
<a name="643" href="#643">643</a>             <strong class="jxr_keyword">return</strong> false;
<a name="644" href="#644">644</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="645" href="#645">645</a>             <em class="jxr_comment">// Restore delimiter.</em>
<a name="646" href="#646">646</a>             System.arraycopy(boundary, 0, boundary, 2, boundary.length - 2);
<a name="647" href="#647">647</a>             boundaryLength = boundary.length;
<a name="648" href="#648">648</a>             boundary[0] = CR;
<a name="649" href="#649">649</a>             boundary[1] = LF;
<a name="650" href="#650">650</a>         }
<a name="651" href="#651">651</a>     }
<a name="652" href="#652">652</a> 
<a name="653" href="#653">653</a> 
<a name="654" href="#654">654</a>     <em class="jxr_javadoccomment">/**</em>
<a name="655" href="#655">655</a> <em class="jxr_javadoccomment">     * Compares &lt;code&gt;count&lt;/code&gt; first bytes in the arrays</em>
<a name="656" href="#656">656</a> <em class="jxr_javadoccomment">     * &lt;code&gt;a&lt;/code&gt; and &lt;code&gt;b&lt;/code&gt;.</em>
<a name="657" href="#657">657</a> <em class="jxr_javadoccomment">     *</em>
<a name="658" href="#658">658</a> <em class="jxr_javadoccomment">     * @param a     The first array to compare.</em>
<a name="659" href="#659">659</a> <em class="jxr_javadoccomment">     * @param b     The second array to compare.</em>
<a name="660" href="#660">660</a> <em class="jxr_javadoccomment">     * @param count How many bytes should be compared.</em>
<a name="661" href="#661">661</a> <em class="jxr_javadoccomment">     *</em>
<a name="662" href="#662">662</a> <em class="jxr_javadoccomment">     * @return &lt;code&gt;true&lt;/code&gt; if &lt;code&gt;count&lt;/code&gt; first bytes in arrays</em>
<a name="663" href="#663">663</a> <em class="jxr_javadoccomment">     *         &lt;code&gt;a&lt;/code&gt; and &lt;code&gt;b&lt;/code&gt; are equal.</em>
<a name="664" href="#664">664</a> <em class="jxr_javadoccomment">     */</em>
<a name="665" href="#665">665</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> arrayequals(byte[] a,
<a name="666" href="#666">666</a>             byte[] b,
<a name="667" href="#667">667</a>             <strong class="jxr_keyword">int</strong> count) {
<a name="668" href="#668">668</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; count; i++) {
<a name="669" href="#669">669</a>             <strong class="jxr_keyword">if</strong> (a[i] != b[i]) {
<a name="670" href="#670">670</a>                 <strong class="jxr_keyword">return</strong> false;
<a name="671" href="#671">671</a>             }
<a name="672" href="#672">672</a>         }
<a name="673" href="#673">673</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="674" href="#674">674</a>     }
<a name="675" href="#675">675</a> 
<a name="676" href="#676">676</a> 
<a name="677" href="#677">677</a>     <em class="jxr_javadoccomment">/**</em>
<a name="678" href="#678">678</a> <em class="jxr_javadoccomment">     * Searches for a byte of specified value in the &lt;code&gt;buffer&lt;/code&gt;,</em>
<a name="679" href="#679">679</a> <em class="jxr_javadoccomment">     * starting at the specified &lt;code&gt;position&lt;/code&gt;.</em>
<a name="680" href="#680">680</a> <em class="jxr_javadoccomment">     *</em>
<a name="681" href="#681">681</a> <em class="jxr_javadoccomment">     * @param value The value to find.</em>
<a name="682" href="#682">682</a> <em class="jxr_javadoccomment">     * @param pos   The starting position for searching.</em>
<a name="683" href="#683">683</a> <em class="jxr_javadoccomment">     *</em>
<a name="684" href="#684">684</a> <em class="jxr_javadoccomment">     * @return The position of byte found, counting from beginning of the</em>
<a name="685" href="#685">685</a> <em class="jxr_javadoccomment">     *         &lt;code&gt;buffer&lt;/code&gt;, or &lt;code&gt;-1&lt;/code&gt; if not found.</em>
<a name="686" href="#686">686</a> <em class="jxr_javadoccomment">     */</em>
<a name="687" href="#687">687</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">int</strong> findByte(byte value,
<a name="688" href="#688">688</a>             <strong class="jxr_keyword">int</strong> pos) {
<a name="689" href="#689">689</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = pos; i &lt; tail; i++) {
<a name="690" href="#690">690</a>             <strong class="jxr_keyword">if</strong> (buffer[i] == value) {
<a name="691" href="#691">691</a>                 <strong class="jxr_keyword">return</strong> i;
<a name="692" href="#692">692</a>             }
<a name="693" href="#693">693</a>         }
<a name="694" href="#694">694</a> 
<a name="695" href="#695">695</a>         <strong class="jxr_keyword">return</strong> -1;
<a name="696" href="#696">696</a>     }
<a name="697" href="#697">697</a> 
<a name="698" href="#698">698</a> 
<a name="699" href="#699">699</a>     <em class="jxr_javadoccomment">/**</em>
<a name="700" href="#700">700</a> <em class="jxr_javadoccomment">     * Searches for the &lt;code&gt;boundary&lt;/code&gt; in the &lt;code&gt;buffer&lt;/code&gt;</em>
<a name="701" href="#701">701</a> <em class="jxr_javadoccomment">     * region delimited by &lt;code&gt;head&lt;/code&gt; and &lt;code&gt;tail&lt;/code&gt;.</em>
<a name="702" href="#702">702</a> <em class="jxr_javadoccomment">     *</em>
<a name="703" href="#703">703</a> <em class="jxr_javadoccomment">     * @return The position of the boundary found, counting from the</em>
<a name="704" href="#704">704</a> <em class="jxr_javadoccomment">     *         beginning of the &lt;code&gt;buffer&lt;/code&gt;, or &lt;code&gt;-1&lt;/code&gt; if</em>
<a name="705" href="#705">705</a> <em class="jxr_javadoccomment">     *         not found.</em>
<a name="706" href="#706">706</a> <em class="jxr_javadoccomment">     */</em>
<a name="707" href="#707">707</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">int</strong> findSeparator() {
<a name="708" href="#708">708</a>         <strong class="jxr_keyword">int</strong> first;
<a name="709" href="#709">709</a>         <strong class="jxr_keyword">int</strong> match = 0;
<a name="710" href="#710">710</a>         <strong class="jxr_keyword">int</strong> maxpos = tail - boundaryLength;
<a name="711" href="#711">711</a>         <strong class="jxr_keyword">for</strong> (first = head;
<a name="712" href="#712">712</a>         (first &lt;= maxpos) &amp;&amp; (match != boundaryLength);
<a name="713" href="#713">713</a>         first++) {
<a name="714" href="#714">714</a>             first = findByte(boundary[0], first);
<a name="715" href="#715">715</a>             <strong class="jxr_keyword">if</strong> (first == -1 || (first &gt; maxpos)) {
<a name="716" href="#716">716</a>                 <strong class="jxr_keyword">return</strong> -1;
<a name="717" href="#717">717</a>             }
<a name="718" href="#718">718</a>             <strong class="jxr_keyword">for</strong> (match = 1; match &lt; boundaryLength; match++) {
<a name="719" href="#719">719</a>                 <strong class="jxr_keyword">if</strong> (buffer[first + match] != boundary[match]) {
<a name="720" href="#720">720</a>                     <strong class="jxr_keyword">break</strong>;
<a name="721" href="#721">721</a>                 }
<a name="722" href="#722">722</a>             }
<a name="723" href="#723">723</a>         }
<a name="724" href="#724">724</a>         <strong class="jxr_keyword">if</strong> (match == boundaryLength) {
<a name="725" href="#725">725</a>             <strong class="jxr_keyword">return</strong> first - 1;
<a name="726" href="#726">726</a>         }
<a name="727" href="#727">727</a>         <strong class="jxr_keyword">return</strong> -1;
<a name="728" href="#728">728</a>     }
<a name="729" href="#729">729</a> 
<a name="730" href="#730">730</a>     <em class="jxr_javadoccomment">/**</em>
<a name="731" href="#731">731</a> <em class="jxr_javadoccomment">     * Thrown to indicate that the input stream fails to follow the</em>
<a name="732" href="#732">732</a> <em class="jxr_javadoccomment">     * required syntax.</em>
<a name="733" href="#733">733</a> <em class="jxr_javadoccomment">     */</em>
<a name="734" href="#734">734</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>
<a name="735" href="#735">735</a>     <strong class="jxr_keyword">extends</strong> IOException {
<a name="736" href="#736">736</a>         <em class="jxr_javadoccomment">/**</em>
<a name="737" href="#737">737</a> <em class="jxr_javadoccomment">         * Constructs a &lt;code&gt;MalformedStreamException&lt;/code&gt; with no</em>
<a name="738" href="#738">738</a> <em class="jxr_javadoccomment">         * detail message.</em>
<a name="739" href="#739">739</a> <em class="jxr_javadoccomment">         */</em>
<a name="740" href="#740">740</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>() {
<a name="741" href="#741">741</a>             <strong class="jxr_keyword">super</strong>();
<a name="742" href="#742">742</a>         }
<a name="743" href="#743">743</a> 
<a name="744" href="#744">744</a>         <em class="jxr_javadoccomment">/**</em>
<a name="745" href="#745">745</a> <em class="jxr_javadoccomment">         * Constructs an &lt;code&gt;MalformedStreamException&lt;/code&gt; with</em>
<a name="746" href="#746">746</a> <em class="jxr_javadoccomment">         * the specified detail message.</em>
<a name="747" href="#747">747</a> <em class="jxr_javadoccomment">         *</em>
<a name="748" href="#748">748</a> <em class="jxr_javadoccomment">         * @param message The detail message.</em>
<a name="749" href="#749">749</a> <em class="jxr_javadoccomment">         */</em>
<a name="750" href="#750">750</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(String message) {
<a name="751" href="#751">751</a>             <strong class="jxr_keyword">super</strong>(message);
<a name="752" href="#752">752</a>         }
<a name="753" href="#753">753</a>     }
<a name="754" href="#754">754</a> 
<a name="755" href="#755">755</a> 
<a name="756" href="#756">756</a>     <em class="jxr_javadoccomment">/**</em>
<a name="757" href="#757">757</a> <em class="jxr_javadoccomment">     * Thrown upon attempt of setting an invalid boundary token.</em>
<a name="758" href="#758">758</a> <em class="jxr_javadoccomment">     */</em>
<a name="759" href="#759">759</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">IllegalBoundaryException</a>
<a name="760" href="#760">760</a>             <strong class="jxr_keyword">extends</strong> IOException {
<a name="761" href="#761">761</a>         <em class="jxr_javadoccomment">/**</em>
<a name="762" href="#762">762</a> <em class="jxr_javadoccomment">         * Constructs an &lt;code&gt;IllegalBoundaryException&lt;/code&gt; with no</em>
<a name="763" href="#763">763</a> <em class="jxr_javadoccomment">         * detail message.</em>
<a name="764" href="#764">764</a> <em class="jxr_javadoccomment">         */</em>
<a name="765" href="#765">765</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">IllegalBoundaryException</a>() {
<a name="766" href="#766">766</a>             <strong class="jxr_keyword">super</strong>();
<a name="767" href="#767">767</a>         }
<a name="768" href="#768">768</a> 
<a name="769" href="#769">769</a>         <em class="jxr_javadoccomment">/**</em>
<a name="770" href="#770">770</a> <em class="jxr_javadoccomment">         * Constructs an &lt;code&gt;IllegalBoundaryException&lt;/code&gt; with</em>
<a name="771" href="#771">771</a> <em class="jxr_javadoccomment">         * the specified detail message.</em>
<a name="772" href="#772">772</a> <em class="jxr_javadoccomment">         *</em>
<a name="773" href="#773">773</a> <em class="jxr_javadoccomment">         * @param message The detail message.</em>
<a name="774" href="#774">774</a> <em class="jxr_javadoccomment">         */</em>
<a name="775" href="#775">775</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">IllegalBoundaryException</a>(String message) {
<a name="776" href="#776">776</a>             <strong class="jxr_keyword">super</strong>(message);
<a name="777" href="#777">777</a>         }
<a name="778" href="#778">778</a>     }
<a name="779" href="#779">779</a> 
<a name="780" href="#780">780</a>     <em class="jxr_javadoccomment">/**</em>
<a name="781" href="#781">781</a> <em class="jxr_javadoccomment">     * An {@link InputStream} for reading an items contents.</em>
<a name="782" href="#782">782</a> <em class="jxr_javadoccomment">     */</em>
<a name="783" href="#783">783</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ItemInputStream</a> <strong class="jxr_keyword">extends</strong> InputStream implements <a href="../../../../org/apache/commons/fileupload/util/Closeable.html">Closeable</a> {
<a name="784" href="#784">784</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The number of bytes, which have been read so far.</em>
<a name="785" href="#785">785</a> <em class="jxr_javadoccomment">         */</em>
<a name="786" href="#786">786</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> total;
<a name="787" href="#787">787</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The number of bytes, which must be hold, because</em>
<a name="788" href="#788">788</a> <em class="jxr_javadoccomment">         * they might be a part of the boundary.</em>
<a name="789" href="#789">789</a> <em class="jxr_javadoccomment">         */</em>
<a name="790" href="#790">790</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> pad;
<a name="791" href="#791">791</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The current offset in the buffer.</em>
<a name="792" href="#792">792</a> <em class="jxr_javadoccomment">         */</em>
<a name="793" href="#793">793</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> pos;
<a name="794" href="#794">794</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Whether the stream is already closed.</em>
<a name="795" href="#795">795</a> <em class="jxr_javadoccomment">         */</em>
<a name="796" href="#796">796</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> closed;
<a name="797" href="#797">797</a> 
<a name="798" href="#798">798</a>         <em class="jxr_javadoccomment">/**</em>
<a name="799" href="#799">799</a> <em class="jxr_javadoccomment">         * Creates a new instance.</em>
<a name="800" href="#800">800</a> <em class="jxr_javadoccomment">         */</em>
<a name="801" href="#801">801</a>         <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ItemInputStream</a>() {
<a name="802" href="#802">802</a>             findSeparator();
<a name="803" href="#803">803</a>         }
<a name="804" href="#804">804</a> 
<a name="805" href="#805">805</a>         <em class="jxr_javadoccomment">/**</em>
<a name="806" href="#806">806</a> <em class="jxr_javadoccomment">         * Called for finding the separator.</em>
<a name="807" href="#807">807</a> <em class="jxr_javadoccomment">         */</em>
<a name="808" href="#808">808</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> findSeparator() {
<a name="809" href="#809">809</a>             pos = MultipartStream.<strong class="jxr_keyword">this</strong>.findSeparator();
<a name="810" href="#810">810</a>             <strong class="jxr_keyword">if</strong> (pos == -1) {
<a name="811" href="#811">811</a>                 <strong class="jxr_keyword">if</strong> (tail - head &gt; keepRegion) {
<a name="812" href="#812">812</a>                     pad = keepRegion;
<a name="813" href="#813">813</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="814" href="#814">814</a>                     pad = tail - head;
<a name="815" href="#815">815</a>                 }
<a name="816" href="#816">816</a>             }
<a name="817" href="#817">817</a>         }
<a name="818" href="#818">818</a> 
<a name="819" href="#819">819</a>         <em class="jxr_javadoccomment">/**</em>
<a name="820" href="#820">820</a> <em class="jxr_javadoccomment">         * Returns the number of bytes, which have been read</em>
<a name="821" href="#821">821</a> <em class="jxr_javadoccomment">         * by the stream.</em>
<a name="822" href="#822">822</a> <em class="jxr_javadoccomment">         * @return Number of bytes, which have been read so far.</em>
<a name="823" href="#823">823</a> <em class="jxr_javadoccomment">         */</em>
<a name="824" href="#824">824</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> getBytesRead() {
<a name="825" href="#825">825</a>             <strong class="jxr_keyword">return</strong> total;
<a name="826" href="#826">826</a>         }
<a name="827" href="#827">827</a> 
<a name="828" href="#828">828</a>         <em class="jxr_javadoccomment">/**</em>
<a name="829" href="#829">829</a> <em class="jxr_javadoccomment">         * Returns the number of bytes, which are currently</em>
<a name="830" href="#830">830</a> <em class="jxr_javadoccomment">         * available, without blocking.</em>
<a name="831" href="#831">831</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurs.</em>
<a name="832" href="#832">832</a> <em class="jxr_javadoccomment">         * @return Number of bytes in the buffer.</em>
<a name="833" href="#833">833</a> <em class="jxr_javadoccomment">         */</em>
<a name="834" href="#834">834</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> available() <strong class="jxr_keyword">throws</strong> IOException {
<a name="835" href="#835">835</a>             <strong class="jxr_keyword">if</strong> (pos == -1) {
<a name="836" href="#836">836</a>                 <strong class="jxr_keyword">return</strong> tail - head - pad;
<a name="837" href="#837">837</a>             }
<a name="838" href="#838">838</a>             <strong class="jxr_keyword">return</strong> pos - head;
<a name="839" href="#839">839</a>         }
<a name="840" href="#840">840</a> 
<a name="841" href="#841">841</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Offset when converting negative bytes to integers.</em>
<a name="842" href="#842">842</a> <em class="jxr_javadoccomment">         */</em>
<a name="843" href="#843">843</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> BYTE_POSITIVE_OFFSET = 256;
<a name="844" href="#844">844</a> 
<a name="845" href="#845">845</a>         <em class="jxr_javadoccomment">/**</em>
<a name="846" href="#846">846</a> <em class="jxr_javadoccomment">         * Returns the next byte in the stream.</em>
<a name="847" href="#847">847</a> <em class="jxr_javadoccomment">         * @return The next byte in the stream, as a non-negative</em>
<a name="848" href="#848">848</a> <em class="jxr_javadoccomment">         *   integer, or -1 for EOF.</em>
<a name="849" href="#849">849</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="850" href="#850">850</a> <em class="jxr_javadoccomment">         */</em>
<a name="851" href="#851">851</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> read() <strong class="jxr_keyword">throws</strong> IOException {
<a name="852" href="#852">852</a>             <strong class="jxr_keyword">if</strong> (closed) {
<a name="853" href="#853">853</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> FileItemStream.ItemSkippedException();
<a name="854" href="#854">854</a>             }
<a name="855" href="#855">855</a>             <strong class="jxr_keyword">if</strong> (available() == 0) {
<a name="856" href="#856">856</a>                 <strong class="jxr_keyword">if</strong> (makeAvailable() == 0) {
<a name="857" href="#857">857</a>                     <strong class="jxr_keyword">return</strong> -1;
<a name="858" href="#858">858</a>                 }
<a name="859" href="#859">859</a>             }
<a name="860" href="#860">860</a>             ++total;
<a name="861" href="#861">861</a>             <strong class="jxr_keyword">int</strong> b = buffer[head++];
<a name="862" href="#862">862</a>             <strong class="jxr_keyword">if</strong> (b &gt;= 0) {
<a name="863" href="#863">863</a>                 <strong class="jxr_keyword">return</strong> b;
<a name="864" href="#864">864</a>             }
<a name="865" href="#865">865</a>             <strong class="jxr_keyword">return</strong> b + BYTE_POSITIVE_OFFSET;
<a name="866" href="#866">866</a>         }
<a name="867" href="#867">867</a> 
<a name="868" href="#868">868</a>         <em class="jxr_javadoccomment">/**</em>
<a name="869" href="#869">869</a> <em class="jxr_javadoccomment">         * Reads bytes into the given buffer.</em>
<a name="870" href="#870">870</a> <em class="jxr_javadoccomment">         * @param b The destination buffer, where to write to.</em>
<a name="871" href="#871">871</a> <em class="jxr_javadoccomment">         * @param off Offset of the first byte in the buffer.</em>
<a name="872" href="#872">872</a> <em class="jxr_javadoccomment">         * @param len Maximum number of bytes to read.</em>
<a name="873" href="#873">873</a> <em class="jxr_javadoccomment">         * @return Number of bytes, which have been actually read,</em>
<a name="874" href="#874">874</a> <em class="jxr_javadoccomment">         *   or -1 for EOF.</em>
<a name="875" href="#875">875</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="876" href="#876">876</a> <em class="jxr_javadoccomment">         */</em>
<a name="877" href="#877">877</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> read(byte[] b, <strong class="jxr_keyword">int</strong> off, <strong class="jxr_keyword">int</strong> len) <strong class="jxr_keyword">throws</strong> IOException {
<a name="878" href="#878">878</a>             <strong class="jxr_keyword">if</strong> (closed) {
<a name="879" href="#879">879</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> FileItemStream.ItemSkippedException();
<a name="880" href="#880">880</a>             }
<a name="881" href="#881">881</a>             <strong class="jxr_keyword">if</strong> (len == 0) {
<a name="882" href="#882">882</a>                 <strong class="jxr_keyword">return</strong> 0;
<a name="883" href="#883">883</a>             }
<a name="884" href="#884">884</a>             <strong class="jxr_keyword">int</strong> res = available();
<a name="885" href="#885">885</a>             <strong class="jxr_keyword">if</strong> (res == 0) {
<a name="886" href="#886">886</a>                 res = makeAvailable();
<a name="887" href="#887">887</a>                 <strong class="jxr_keyword">if</strong> (res == 0) {
<a name="888" href="#888">888</a>                     <strong class="jxr_keyword">return</strong> -1;
<a name="889" href="#889">889</a>                 }
<a name="890" href="#890">890</a>             }
<a name="891" href="#891">891</a>             res = Math.min(res, len);
<a name="892" href="#892">892</a>             System.arraycopy(buffer, head, b, off, res);
<a name="893" href="#893">893</a>             head += res;
<a name="894" href="#894">894</a>             total += res;
<a name="895" href="#895">895</a>             <strong class="jxr_keyword">return</strong> res;
<a name="896" href="#896">896</a>         }
<a name="897" href="#897">897</a> 
<a name="898" href="#898">898</a>         <em class="jxr_javadoccomment">/**</em>
<a name="899" href="#899">899</a> <em class="jxr_javadoccomment">         * Closes the input stream.</em>
<a name="900" href="#900">900</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="901" href="#901">901</a> <em class="jxr_javadoccomment">         */</em>
<a name="902" href="#902">902</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close() <strong class="jxr_keyword">throws</strong> IOException {
<a name="903" href="#903">903</a>             close(false);
<a name="904" href="#904">904</a>         }
<a name="905" href="#905">905</a> 
<a name="906" href="#906">906</a>         <em class="jxr_javadoccomment">/**</em>
<a name="907" href="#907">907</a> <em class="jxr_javadoccomment">         * Closes the input stream.</em>
<a name="908" href="#908">908</a> <em class="jxr_javadoccomment">         * @param pCloseUnderlying Whether to close the underlying stream</em>
<a name="909" href="#909">909</a> <em class="jxr_javadoccomment">         *   (hard close)</em>
<a name="910" href="#910">910</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="911" href="#911">911</a> <em class="jxr_javadoccomment">         */</em>
<a name="912" href="#912">912</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close(<strong class="jxr_keyword">boolean</strong> pCloseUnderlying) <strong class="jxr_keyword">throws</strong> IOException {
<a name="913" href="#913">913</a>             <strong class="jxr_keyword">if</strong> (closed) {
<a name="914" href="#914">914</a>                 <strong class="jxr_keyword">return</strong>;
<a name="915" href="#915">915</a>             }
<a name="916" href="#916">916</a>             <strong class="jxr_keyword">if</strong> (pCloseUnderlying) {
<a name="917" href="#917">917</a>                 closed = <strong class="jxr_keyword">true</strong>;
<a name="918" href="#918">918</a>                 input.close();
<a name="919" href="#919">919</a>             } <strong class="jxr_keyword">else</strong> {
<a name="920" href="#920">920</a>                 <strong class="jxr_keyword">for</strong> (;;) {
<a name="921" href="#921">921</a>                     <strong class="jxr_keyword">int</strong> av = available();
<a name="922" href="#922">922</a>                     <strong class="jxr_keyword">if</strong> (av == 0) {
<a name="923" href="#923">923</a>                         av = makeAvailable();
<a name="924" href="#924">924</a>                         <strong class="jxr_keyword">if</strong> (av == 0) {
<a name="925" href="#925">925</a>                             <strong class="jxr_keyword">break</strong>;
<a name="926" href="#926">926</a>                         }
<a name="927" href="#927">927</a>                     }
<a name="928" href="#928">928</a>                     skip(av);
<a name="929" href="#929">929</a>                 }
<a name="930" href="#930">930</a>             }
<a name="931" href="#931">931</a>             closed = <strong class="jxr_keyword">true</strong>;
<a name="932" href="#932">932</a>         }
<a name="933" href="#933">933</a> 
<a name="934" href="#934">934</a>         <em class="jxr_javadoccomment">/**</em>
<a name="935" href="#935">935</a> <em class="jxr_javadoccomment">         * Skips the given number of bytes.</em>
<a name="936" href="#936">936</a> <em class="jxr_javadoccomment">         * @param bytes Number of bytes to skip.</em>
<a name="937" href="#937">937</a> <em class="jxr_javadoccomment">         * @return The number of bytes, which have actually been</em>
<a name="938" href="#938">938</a> <em class="jxr_javadoccomment">         *   skipped.</em>
<a name="939" href="#939">939</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="940" href="#940">940</a> <em class="jxr_javadoccomment">         */</em>
<a name="941" href="#941">941</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">long</strong> skip(<strong class="jxr_keyword">long</strong> bytes) <strong class="jxr_keyword">throws</strong> IOException {
<a name="942" href="#942">942</a>             <strong class="jxr_keyword">if</strong> (closed) {
<a name="943" href="#943">943</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> FileItemStream.ItemSkippedException();
<a name="944" href="#944">944</a>             }
<a name="945" href="#945">945</a>             <strong class="jxr_keyword">int</strong> av = available();
<a name="946" href="#946">946</a>             <strong class="jxr_keyword">if</strong> (av == 0) {
<a name="947" href="#947">947</a>                 av = makeAvailable();
<a name="948" href="#948">948</a>                 <strong class="jxr_keyword">if</strong> (av == 0) {
<a name="949" href="#949">949</a>                     <strong class="jxr_keyword">return</strong> 0;
<a name="950" href="#950">950</a>                 }
<a name="951" href="#951">951</a>             }
<a name="952" href="#952">952</a>             <strong class="jxr_keyword">long</strong> res = Math.min(av, bytes);
<a name="953" href="#953">953</a>             head += res;
<a name="954" href="#954">954</a>             <strong class="jxr_keyword">return</strong> res;
<a name="955" href="#955">955</a>         }
<a name="956" href="#956">956</a> 
<a name="957" href="#957">957</a>         <em class="jxr_javadoccomment">/**</em>
<a name="958" href="#958">958</a> <em class="jxr_javadoccomment">         * Attempts to read more data.</em>
<a name="959" href="#959">959</a> <em class="jxr_javadoccomment">         * @return Number of available bytes</em>
<a name="960" href="#960">960</a> <em class="jxr_javadoccomment">         * @throws IOException An I/O error occurred.</em>
<a name="961" href="#961">961</a> <em class="jxr_javadoccomment">         */</em>
<a name="962" href="#962">962</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> makeAvailable() <strong class="jxr_keyword">throws</strong> IOException {
<a name="963" href="#963">963</a>             <strong class="jxr_keyword">if</strong> (pos != -1) {
<a name="964" href="#964">964</a>                 <strong class="jxr_keyword">return</strong> 0;
<a name="965" href="#965">965</a>             }
<a name="966" href="#966">966</a> 
<a name="967" href="#967">967</a>             <em class="jxr_comment">// Move the data to the beginning of the buffer.</em>
<a name="968" href="#968">968</a>             total += tail - head - pad;
<a name="969" href="#969">969</a>             System.arraycopy(buffer, tail - pad, buffer, 0, pad);
<a name="970" href="#970">970</a> 
<a name="971" href="#971">971</a>             <em class="jxr_comment">// Refill buffer with new data.</em>
<a name="972" href="#972">972</a>             head = 0;
<a name="973" href="#973">973</a>             tail = pad;
<a name="974" href="#974">974</a> 
<a name="975" href="#975">975</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a name="976" href="#976">976</a>                 <strong class="jxr_keyword">int</strong> bytesRead = input.read(buffer, tail, bufSize - tail);
<a name="977" href="#977">977</a>                 <strong class="jxr_keyword">if</strong> (bytesRead == -1) {
<a name="978" href="#978">978</a>                     <em class="jxr_comment">// The last pad amount is left in the buffer.</em>
<a name="979" href="#979">979</a>                     <em class="jxr_comment">// Boundary can't be in there so signal an error</em>
<a name="980" href="#980">980</a>                     <em class="jxr_comment">// condition.</em>
<a name="981" href="#981">981</a>                     <strong class="jxr_keyword">final</strong> String msg = <span class="jxr_string">"Stream ended unexpectedly"</span>;
<a name="982" href="#982">982</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(msg);
<a name="983" href="#983">983</a>                 }
<a name="984" href="#984">984</a>                 <strong class="jxr_keyword">if</strong> (notifier != <strong class="jxr_keyword">null</strong>) {
<a name="985" href="#985">985</a>                     notifier.noteBytesRead(bytesRead);
<a name="986" href="#986">986</a>                 }
<a name="987" href="#987">987</a>                 tail += bytesRead;
<a name="988" href="#988">988</a> 
<a name="989" href="#989">989</a>                 findSeparator();
<a name="990" href="#990">990</a>                 <strong class="jxr_keyword">int</strong> av = available();
<a name="991" href="#991">991</a> 
<a name="992" href="#992">992</a>                 <strong class="jxr_keyword">if</strong> (av &gt; 0 || pos != -1) {
<a name="993" href="#993">993</a>                     <strong class="jxr_keyword">return</strong> av;
<a name="994" href="#994">994</a>                 }
<a name="995" href="#995">995</a>             }
<a name="996" href="#996">996</a>         }
<a name="997" href="#997">997</a> 
<a name="998" href="#998">998</a>         <em class="jxr_javadoccomment">/**</em>
<a name="999" href="#999">999</a> <em class="jxr_javadoccomment">         * Returns, whether the stream is closed.</em>
<a name="1000" href="#1000">1000</a> <em class="jxr_javadoccomment">         * @return True, if the stream is closed, otherwise false.</em>
<a name="1001" href="#1001">1001</a> <em class="jxr_javadoccomment">         */</em>
<a name="1002" href="#1002">1002</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isClosed() {
<a name="1003" href="#1003">1003</a>             <strong class="jxr_keyword">return</strong> closed;
<a name="1004" href="#1004">1004</a>         }
<a name="1005" href="#1005">1005</a>     }
<a name="1006" href="#1006">1006</a> }
</pre>
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